ROGURGINGETEn, LATAt
“7
PS
‘ BODY WEIGHTS
Data
Brookhaven
the
from
.
the Marshallese
to determine the body weight of
male body weight is 72 kg for Bikini,
3,14
.
summarized
been
have
’
Laboratory
National
adult
The average
people.
62 kg for Rongelap,
71 kg for Enewetak,
The average, therefore, is very near the 70-kg value of
and 70 kg for Utirik.
As a result, we have used 70 kg as the average body weight
reference man. >
The average body weight for 113 adult
in our dose calculations.
females
in
It is 67 kg for 30 Utirik females and 63 kg
the Enewetak population is 61 kg.
for 36 Rongelap females.'>
STRONTIUM-90 METHODOLOGY
Bone-marrow doses and dose rates are calculated in two steps.
model of Bennett”
is used to correlate
First,
the 05 concentrations
the
in diet
with that in mineral bone.
Second, the dosimetric model developed by Spiers?
is
bone-marrow dose
used
to
calculate
the
rate
from
the
concentration
in
mineral bone.
Bennett's
empirical
model
is
developed
from
90.
concentrations
in foods and autopsy bone samples from New York and San Francisco.
includes
age-dependent
variations
that
allow us
found
It also
to make dose estimates
for
children as well as adults.
Using’ Spiers’
filled
cavity
model we calculate the dose rate DS
in bone
from
the
from geometrical
considerations,
endosteal
D.
= 0.315
United
cells
and
D>, = 0.434,
Nations
The dose
are
rates
Scientific
are
small,
90g, concentration
in mineral
the dose
the
calculated
rates
using
respectively.
Committee on
determined
to a
directly
Therefore rads are equivalent to rems.
the
These
the
and
to
factors
not
by
of
bone.
Then
bone marrow dD, and
conversion
Effects
tissue-
are
factors
quoted
Atomic
DL,
by
the
Radiation. ~°
comparison
to
radium.
Because bone marrow is considered a
blood-forming organ (annual dose limit equals 500 mrem/y) and endosteal cells
are in an other organ category (annual dose limit equals
1500 mrem/y),
.
ou:
:
90
bone marrow is the more sensitive organ in bone for
Sr (see Ref.
21).
the